Pump + Spray
Choose sublingual, targeted freshness, or spray throughout the day for instant freshness.
OG3™ Oxygen + Hydration Therapy
Your MouthWas Born Alive. Let's Keep It That Way.
Rainbow Smile is Biome Food™ — a certified organic daily ritual that supports your mouth's living ecology.
Bad Breath Isn't NormalIt's a Signal.
The Science Behind Bad Breath
Baby's breath, pure, fresh, alive. Modern life disrupts the thought that natural harmony. Cleaning products mask. Rainbow Smile OG3™ supports oxygen-rich freshness — the way your mouth was designed to work.
2%
Oxygen-Poor Saliva
Low oxygen creates the environment where bad-breath bacteria thrive and damage tissues.
20%
Healthy Saliva
OG3™ Drops restore oxygen to healthy levels — feeding good bacteria, crowding out the bad.
Three Flavors. One Formula.
Alcohol freedaily oral wellness.
All day spray freshness and sublingual wellness ritual in 3 flavors
Subscribe & SaveRainbow Smile OG3™ Zesty Cinnamon
Subscribe & SaveRainbow Smile OG3™ Pure Cleanse
Subscribe & SaveRainbow Smile OG3™ Minty Fusion
Free Returns
Not happy? We'll sort it.
Free Community
Join 50,000+ biome hackers
Free Book
Download William's guide
24/7 Support
support@rainbowsmile.com
"We're not selling toothpaste. We're not selling mouthwash. We're supporting theliving ecosystemyour mouth was born with. This is oral care for the 21st century."
— William Robertson, Founder & Microbiome Pioneer
Free · The Biome Hacker Community
The Biome Hacker's Code.Read the book.
A field guide to human potential. Free for Biome Hackers. Your mouth is the command centre of your biology. This book explains why, and what to do about it.
Foreword by Dr. Vanita K. Gupta, PhD, MBA — Chief Founding Science Officer, Rainbow Smile
- Why your oral microbiome influences whole-body health — from gut to brain.
- What conventional oral care may be quietly doing to your bacterial allies.
- How to upgrade your mOS™ — your Microbial Operating System — starting today.
- The 60-second daily protocols that support oral vitality and long-term resilience.
- How to join the Biome Hacker movement and the community building around it.
Get Your Free Copy
Instant download. No credit card. Join biome hackers community.
Dr. Gupta’s foreword credit displayed prominently
The Daily Reset
60 Secondsto freshness
A simple 60-second oral reset for lasting wellness
The 60-Second Hold
Apply 1-2 drops under the tongue or spray directly into the mouth. Hold for 30–60 seconds to allow to penetrate and activate.
Safe to Swallow
Our formula is 100% natural, made from Certified Organic Coconut Glycerin. Gentle, nourishing, and completely safe.
Feel Alive
Experience the fresh vitality of a truly living, balanced oral ecosystem. Naturally sweet taste. Clean — not sterilized. Alive.
The Living Ecosystem
Your mouthis alive
The mouth is your control panel for programming your energy, immunity, and vitality through 1,000+ swallows a day. Healthy microbes and tissues thrive on bio-available oxygen. Bottled in ultra-violet Miron glass for potency.
Oral · Gut · Brain Axis
Oral Care is Self CareOral Care is Gut Care
Your mouth is the gateway to your gut, and your gut is the gateway to whole-body wellness. OG3 helps balance the oral-gut axis, supporting immunity, digestion, mood, and vitality.
A living daily ritual for inner wellbeing.
Start Your Ritual
This is Biome Food ™
Feed YourEcology
And so is the community learning to feed it.
“I stopped looking for the next miracle product and started seeing actual change — in my breath, my gums, my mornings. That’s the difference Rainbow Smile made. I tell everyone.”
Maya R.
Los Angeles
Why Trust Us
Premium in waysthat actually matter.
Every decision at Rainbow Smile is made with your body, the planet, and real science in mind.
UBU Biome-Safe Formula
Like a fingerprint, no two mouths are alike, and your formula shouldn’t pretend otherwise. UBU™ means every ingredient is biome-safe by design, working with your unique ecology instead of overwriting it.
100% Vegan — Cruelty-Free
Vegan. No animal testing. 100% plant-based. Every ingredient is clean, certified organic, and chosen because it belongs in a living ecosystem, not because it’s cheap or convenient.
Science + Nature
Your mouth is an ecosystem. Science has finally caught up to the powerful but often overlooked ecology inside you. A network of beneficial microbes lives in your mouth, quietly working to maintain optimal oral health. They need food. Rainbow Smile gives it to them.
Vegan
Cruelty-Free
Regenerative Sourced
Science-Backed
UBU™ Biome Safe
FSC Certified
About the Founder
Hi, I'mWilliam
Founder of Rainbow Smile, a company born from a deep passion for wellness, the wisdom of nature, and the belief that true health begins within the small but mighty ecosystem living inside each of us.
Rainbow Smile is more than just a line of products, it’s a movement. A movement toward reconnecting with nature, reclaiming vibrant, whole-body health, and embracing joy-filled, authentic smiles as symbols of genuine wellness.
“Our Mission: A Planet Smiling — A planet smiling in harmony with its own living code, where every mouth becomes a messenger of peace and every smile a sign of health restored.”
— William Robertson
Love Serves All.™
Every bottle of Rainbow Smile supports oral wellness access in Kenya, where 80% of rural communities have no access to dental care. Through our partnership with Springboard Connectivity, directed by Tracy Tarlow, we donate OG3™ to communities who deserve the same support. Feed your ecology. Feed someone else’s too.
Need Help?
Frequently Asked Questions
What is Biome Food™?
Biome Food™ is our proprietary blend of prebiotic, microbiome-friendly nutrients that feed the beneficial bacteria in your mouth — helping your oral ecosystem stay balanced and thriving.
What is OG3™?
OG3™ is our oxygen-rich oral care formula, designed to support the oral-gut axis with bioavailable oxygen and plant-based, microbiome-friendly compounds.
How do I use the spray vs. the pump?
Use the spray for quick, on-the-go freshness, and the pump for your daily measured ritual. Both deliver the same OG3™ formula — choose whichever fits the moment.
What does sublingual mean?
Sublingual means “under the tongue.” Holding the formula there briefly lets the active compounds absorb directly through the tissue for faster delivery.
Is it really safe to swallow?
Yes. Every ingredient is food-grade and designed to be swallowed safely, carrying its benefits along your oral-gut axis.
Love Serves All
Your Unique Biome. Unlocked
Join 50,000+ biome hackers who’ve returned to their original design. Sophisticated science. Joyful results. Every smile — uniquely yours.
Donates to Underserved Communities · springboardconnectivity.org